Harrow.



H. G. COPENHAGEN.

HARROW.

APPLICATION FILED AUG. 10, 1912.

Patented Nov. 4, 1913.

HEElvIAN C. COPENHAGEN, OF AUBURN, WASHINGTON.

Specification of Letters Patent.

HARBOl/V.

Patented Nov. 1, 1913.

Application filed August 10, 1912. Serial No. 714,461.

] all whom it may concern Be it known that I, HERMAN C. COPEN- I-IAGEN,a citizen of the United States, residing at Auburn, in the county ofKing and State of Washington, have invented certain new and usefulImprovements in Harrows, of which the following is a specification.

This invention relates to improvements in harrows.

The object of my improvements is first, the provision of devices wherebythe inclination of the harrow teeth may be conveniently regulated sothat the harrow can be used selectively for p'ulverizing or cultivatingpurposes; and second; the provision of means whereby the various toothcarrying bars are rendered rotatable in order that the teeth will yieldto any obstacles encountered in the ground being worked or forautomatically freeing the teeth of accumulations of roots or other trashwhich may be collected in the progress of the harrow.

The invention consists in the novel construction and combination ofparts as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a perspective view of a harrowembodying my invention. Fig. 2 is a longitudinal vertical section of thesame. Fig. 3 is a detail sectional view taken through one of the toothbars.

The reference numerals 5 designate the longitudinal rails of a harrowframe which are provided at the forward ends with hooks 6 for connectionwith the draft appliances. Intermediate said rails is a third rail 5.These rails are provided with a series of spaced openings 7 which serveas journal bearings for transversely arranged bars 8 which, as shown inFig. 3, are desirably of a substantially U-shape in cross section.Harrow teeth 9 are detachably secured to said bars as, for example, bynutted U-bolts 10. Provided at the adjacent ends of the several toothbars are crank arms 11, the crank pins 11 of which are journaled in acoupling rod 12. Secured to said bars are pairs of spurs 13 and 18 whichare arranged at angles of approximately 120 with respect to each otherand to the axes of the several harrow teeth oi the respective bars 8. Asillustrated, each pair of said spurs is desirably formed integral with ashank 13 and the latter are secured to the bars as by bolts 14. Fixedlymounted upon one of said bars is a wheel 15 having in its periphery aratchet tooth 15?. A lever pawl 16 is tulcrumed intermediate its lengthto a hand lever 17 which, in turn, is fulcrumed by a pin 18 to the rail5 in proximity to the wheel 15. p c

A plate 19 is rigidly secured to the rail 5 andhas its upper serratededge disposed concentrically to the axis of the pin 18. Pivotallyconnected to the hand lever 17 is a pawl 20 whichis adapted forengagement in a selected one of the serrations of plate 19. A rod 22operatively connects pawls 20 with a bellcrank lever 23 which is carriedby said hand lever and is utilized in disengaging the pawl from saidplate and in opposition to a spring 241 when the hand lever is to bemanipulated to advance or recede the pawl 16 for the purpose ofeftecting a partial rotation to the Wheel 15. By such devices andthrough the cooperation of the crank arms 11 and the coupling rod 12 thebars 8 are influenced to present the harrow teeth 9 in verticalpositions and at various inclinations therefrom. 25 is a helical springconnected to one arm of the lever pawl 16 and tends to hold the pawl incontact with the periphery of Wheel 15. Connected to the other arm ofthe lever pawl is a chain or line 26 which passes over a guide pulley 27upon the hand lever and thence trails upon the ground behind the harrow.

In operation, when brush, roots or trash is gathered upon the harrowteeth, or where the latter are about to encounter a large rock or otherobstacle, the operator pushes down upon the trailing end of line 26. l ihereupon, the continued travel of the harrow puts a strain upon the lineto cause the pawl 16 to be disengaged from the wheel tooth 15. he barsare thus rendered free to be rotated by onward movement of the harrowwhich causes the teeth 9 to be swung rearwardly and similarly act uponthe spurs 13 and 13 as they are successively brought into positions topenetrate the ground; and whereby the revolutions of the teeth areaccomplished until interrupted by the tooth 15 of the wheel engagingpawl 16 when the teeth are restored to operative positions as determinedby the positioning of the same through the medium of the hand lever 17,as above explained.

l/Vhat I claim, is

1. In a harrow, the combination of the frame, tooth bars, rotatablymounted in the frame, a lever pawl, a stop on one of the bars andengngeahle by said pawl, and an adjustable support for said pawl.

2. In :1 borrow, the combination with the frame, bars rotatablyconnected to the frame, teeth secured to said hers, means carried by thebars and cooperating with said teeth for revolving" the latter byengaging in the ground in the progressive travel of the herroW, ofe-Wheel fixedly mounted upon one of said here and provided with aratchet tooth, at toothed segment mounted on the frmne, a manuallycontrolled lever pivoted to said frame, a pawl carried by said lever andengaging said segment, 2L lever pawl carried by the n'mmmlly-controlledlever engaging" said toothed Wheel, the manuallycontrolled lever beingshiftable to control the angularity of the barrow teeth.

Signed at Seattle; Washington, this 19th day of July 1912.

HERMAN C. COPENHAGEN. Witnesses HORACE BARNES, J. V. NooDWARD'.

Copies of this patent may be obtained for five cents each,fiyfa'ddressing the Commissioner of Patents.

I Washington, 1). c.

